Every week, somewhere in America, a startup employee misses a 30-day window and ends up paying substantially more in taxes than they needed to. The tool they failed to use was the 83(b) election. The reason they missed it was almost always the same: nobody told them clearly, early enough, why it mattered.
I’m writing this partly because I’ve helped structure equity programs at a startup, and partly because I’ve seen the downstream consequences of getting this wrong. If you’re a startup employee who just received restricted stock or early-exercised stock options, this is the most important financial decision you’ll make in the next 30 days.
What an 83(b) election actually is
When you receive equity that vests over time, the IRS’s default rule is that you owe taxes when the equity vests — not when you receive it. Each vesting event is a taxable moment, and you’re taxed on the fair market value of the shares at the time of vesting.
An 83(b) election lets you flip that. By filing a simple form with the IRS within 30 days of receiving the equity, you elect to be taxed now — at the current (presumably low) value — rather than at each vesting event.
Why does this matter? Because if your company grows, the value of your shares grows. Under the default rules, you’d owe taxes on that appreciated value as it vests. Under an 83(b) election, you pay taxes on the low early value now, and everything after that is typically treated as a capital gain rather than ordinary income.
The math can be dramatic. Taxes on $10,000 worth of stock at early-exercise prices are manageable. Taxes on $500,000 worth of stock as it vests — at ordinary income rates — is a problem people often aren’t prepared for.
The 30-day rule is hard
The window opens the day you receive the equity. Not the day you sign the grant agreement. Not the day you exercise options. The day of the “transfer” or “grant” that starts the vesting clock. And the IRS does not grant extensions. If you miss it, it’s gone.
The filing itself is simple — a letter to the IRS, a copy to your employer, a copy for your records. The hard part is knowing to do it and doing it immediately.
Who this applies to
This matters most for:
Founders receiving restricted stock at incorporation. If you’re a founder and you received shares at the very beginning that will vest over time (a common structure), an 83(b) election filed immediately is almost always the right call. The shares are worth almost nothing now. The potential gain is large.
Employees who early-exercise stock options. Many startup option grants allow early exercise — you can buy shares before they vest. This is only worth doing if you file an 83(b), because otherwise you’ve just created a taxable event on each vesting date without any of the benefits of early exercise.
Anyone receiving restricted stock units (RSUs) with a low strike price. Less common at very early startups but worth understanding if your grant has this structure.
What I tell people
File the 83(b) the day you receive the equity, or as close to it as possible. Don’t wait until you’ve talked to an accountant, because the accountant might not have availability this week and the 30-day clock doesn’t care. Send it certified mail so you have proof of the mailing date.
Then call a tax professional to understand the full implications for your specific situation — this post is not tax advice, and there are scenarios (low growth potential, equity you’re not confident in) where an 83(b) election doesn’t make sense. But the default action for most startup equity recipients should be: file immediately, then understand.
The cost of filing when you didn’t need to is minimal. The cost of not filing when you should have is potentially enormous.
This post is for general informational purposes only and does not constitute legal, tax, or financial advice. The 83(b) election has significant tax implications specific to your individual situation. Please consult a licensed tax professional or attorney before making any decisions about equity compensation.